CVE-2021-39152: debian debian_linux Deserialization of Untrusted Data

Vulnerability summary

CVE-2021-39152 is a high (CVSS 8.5) Deserialization of Untrusted Data vulnerability in debian debian_linux. EPSS estimates a 11.38% chance of exploitation in the next 30 days, higher than 95.9% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 23-08-2021
   PublishedVulnerability first disclosed.
2. 07-10-2026
   Last modifiedVulnerability information updated.

Description

XStream is a simple library to serialize objects to XML and back again. In affected versions this vulnerability may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream with a Java runtime version 14 to 8. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the [Security Framework](https://x-stream.github.io/security.html#framework), you will have to use at least version 1.4.18.

• CWE-502Deserialization of Untrusted DataThe product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
• CWE-918Server-Side Request Forgery (SSRF)The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.